LTC3111 - VCC shorting to Ground

Discussion in 'The Projects Forum' started by Shawn Mathew Kailath, Jun 5, 2015.

  1. Shawn Mathew Kailath

    Thread Starter New Member

    Jun 5, 2015
    2
    0
    Hello,

    I'm using the LTC3111. I have followed the typical application on page 1 of datasheet.
    I'm operating in burst mode and no load current is drawn.
    When I power up the IC, the output Vout (pin 12 of MSOP 16) goes to ground pretty quickly.
    The only clues I have of what exactly is going on:
    1. the oscope probes are connected to FB, VCC, VIN and Vout. There is a lot of noise and spikes in the waveform.
    2. The current meter in my supply is showing 100mA-22mA-1mA depending on my voltage input.

    Please help me understand why the IC is shorting internally.

    Thank you,
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,995
    3,229
    Post a schematic of how the device is connected.
    Otherwise we are mostly guessing.
     
  3. Shawn Mathew Kailath

    Thread Starter New Member

    Jun 5, 2015
    2
    0
    Please see attached the schematic of the circuit.
     
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